If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

As a whole I am both
safe and secure.

Behead me and I become
a place of meeting.

Behead me again and I am
the partner of ready.

Restore me, and I become
the domain of beasts.

What am I?

1 rabbit saw 9 elephants while going to the river. Every elephant saw 3 monkeys going toward the river. Each monkey had 1 parrot in each hand. How many animals are going towards the river?

O_er_t_o_

Complete the missing letters of the given word.

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

Where do fish keep their money?

If an electric train is travelling south, then which way is the smoke going?

There is a shop where written:
Buy 1 for $1
10 for $2
100 for $3
I needed 999 and still only paid $3. How could this be financially viable for the shop-keeper?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?